override/implement: correctly generate call to super method with vararg arguments

#KT-7580 FIxed

idea/testData/codeInsight/overrideImplement/varArgs.kt

@@ -0,0 +1,7 @@
+open class S {
+    open fun s(vararg v: Int) {}
+}
+
+class D : S() {
+    <caret>
+}

idea/testData/codeInsight/overrideImplement/varArgs.kt.after

@@ -0,0 +1,9 @@
+open class S {
+    open fun s(vararg v: Int) {}
+}
+
+class D : S() {
+    override fun s(vararg v: Int) {
+        super.s(*v)
+    }
+}